The scrotum is the sac (pouch) that contains the testes, blood vessels, and part of the spermatic cord. It is located behind the penis.
Male reproductive anatomy
Behrman RE. Nelson Textbook of Pediatrics. 17th ed. Philadelphia, Pa: WB Saunders; 2004.
Wein AJ. Campbell - Walsh Urology. 9th ed. St. Louis, Mo: WB Saunders; 2007.